Properties such as boiling point, freezing point, and vapour pressure of a pure solvent change when solute molecules are added to get homogenous solution. These are called colligative properties.
Anwer the following questions:
i.`0.001 m NaCl`
ii.0.001 m urea
iii.`0.001 m MgCl_(2)`
iv.`0.001 m CH_(3)COOH`
Increasing order of boiling points

Options

A. `(ii) lt (iv) lt (i) lt (iii)`
B. `(iv) lt (i) lt (ii) lt (iii)`
C. `(iii) lt (ii) lt (i) lt (iiv)`
D. `(i) lt (ii) lt (iii) lt (iv)`

Answer

A

Explanation

Boiling point is higher if `DeltaT_(b)` is higher which in turn depends on `m_("effective") (=im_("effective")`.
`:.` 0.001 m urea `lt` 0.001 m `CH_(3)COOH lt 0.001 m NaCl lt 0.001 m MgCl_(2)`